Adding upstream version 1.2.2.upstream/1.2.2upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1983 insertions, 0 deletions

diff --git a/src/extension/internal/pdfinput/svg-builder.cpp b/src/extension/internal/pdfinput/svg-builder.cpp
new file mode 100644
index 0000000..9c49d37
--- /dev/null
+++ b/src/extension/internal/pdfinput/svg-builder.cpp
@@ -0,0 +1,1983 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Native PDF import using libpoppler.
+ *
+ * Authors:
+ *   miklos erdelyi
+ *   Jon A. Cruz <jon@joncruz.org>
+ *
+ * Copyright (C) 2007 Authors
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"  // only include where actually required!
+#endif
+
+#include <string> 
+
+#ifdef HAVE_POPPLER
+
+#include "svg-builder.h"
+#include "pdf-parser.h"
+
+#include "document.h"
+#include "object/sp-namedview.h"
+#include "png.h"
+
+#include "xml/document.h"
+#include "xml/node.h"
+#include "xml/repr.h"
+#include "svg/svg.h"
+#include "svg/path-string.h"
+#include "svg/css-ostringstream.h"
+#include "svg/svg-color.h"
+#include "color.h"
+#include "util/units.h"
+#include "display/nr-filter-utils.h"
+#include "libnrtype/font-instance.h"
+#include "object/sp-defs.h"
+
+#include "Function.h"
+#include "GfxState.h"
+#include "GfxFont.h"
+#include "Stream.h"
+#include "Page.h"
+#include "UnicodeMap.h"
+#include "GlobalParams.h"
+
+namespace Inkscape {
+namespace Extension {
+namespace Internal {
+
+//#define IFTRACE(_code)  _code
+#define IFTRACE(_code)
+
+#define TRACE(_args) IFTRACE(g_print _args)
+
+/**
+ * \struct SvgTransparencyGroup
+ * \brief Holds information about a PDF transparency group
+ */
+struct SvgTransparencyGroup {
+    double bbox[6]; // TODO should this be 4?
+    Inkscape::XML::Node *container;
+
+    bool isolated;
+    bool knockout;
+    bool for_softmask;
+
+    SvgTransparencyGroup *next;
+};
+
+/**
+ * \class SvgBuilder
+ * 
+ */
+
+SvgBuilder::SvgBuilder(SPDocument *document, gchar *docname, XRef *xref)
+{
+    _is_top_level = true;
+    _doc = document;
+    _docname = docname;
+    _xref = xref;
+    _xml_doc = _doc->getReprDoc();
+    _container = _root = _doc->getReprRoot();
+    _init();
+
+    // Set default preference settings
+    _preferences = _xml_doc->createElement("svgbuilder:prefs");
+    _preferences->setAttribute("embedImages", "1");
+    _preferences->setAttribute("localFonts", "1");
+}
+
+SvgBuilder::SvgBuilder(SvgBuilder *parent, Inkscape::XML::Node *root) {
+    _is_top_level = false;
+    _doc = parent->_doc;
+    _docname = parent->_docname;
+    _xref = parent->_xref;
+    _xml_doc = parent->_xml_doc;
+    _preferences = parent->_preferences;
+    _container = this->_root = root;
+    _init();
+}
+
+SvgBuilder::~SvgBuilder() = default;
+
+void SvgBuilder::_init() {
+    _font_style = nullptr;
+    _font_specification = nullptr;
+    _font_scaling = 1;
+    _need_font_update = true;
+    _in_text_object = false;
+    _invalidated_style = true;
+    _current_state = nullptr;
+    _width = 0;
+    _height = 0;
+
+    // Fill _availableFontNames (Bug LP #179589) (code cfr. FontLister)
+    std::vector<PangoFontFamily *> families;
+    font_factory::Default()->GetUIFamilies(families);
+    for (auto & familie : families) {
+        _availableFontNames.emplace_back(pango_font_family_get_name(familie));
+    }
+
+    _transp_group_stack = nullptr;
+    SvgGraphicsState initial_state;
+    initial_state.softmask = nullptr;
+    initial_state.group_depth = 0;
+    _state_stack.push_back(initial_state);
+    _node_stack.push_back(_container);
+
+    _ttm[0] = 1; _ttm[1] = 0; _ttm[2] = 0; _ttm[3] = 1; _ttm[4] = 0; _ttm[5] = 0;
+    _ttm_is_set = false;
+}
+
+/**
+ * We're creating a multi-page document, push page number.
+ */
+void SvgBuilder::pushPage() {
+    // Move page over by the last page width
+    if (_page && this->_width) {
+        int gap = 20;
+        _page_left += this->_width + gap;
+        // TODO: A more interesting page layout could be implemented here.
+    }
+    _page_num += 1;
+    _page_offset = true;
+
+    if (_page) {
+        Inkscape::GC::release(_page);
+    }
+    _page = _xml_doc->createElement("inkscape:page");
+    _page->setAttributeSvgDouble("x", _page_left);
+    _page->setAttributeSvgDouble("y", _page_top);
+    auto _nv = _doc->getNamedView()->getRepr();
+    _nv->appendChild(_page);
+}
+
+void SvgBuilder::setDocumentSize(double width, double height) {
+    this->_width = width;
+    this->_height = height;
+
+    if (_page_num < 2) {
+        _root->setAttributeSvgDouble("width", width);
+        _root->setAttributeSvgDouble("height", height);
+    }
+    if (_page) {
+        _page->setAttributeSvgDouble("width", width);
+        _page->setAttributeSvgDouble("height", height);
+    }
+}
+
+/**
+ * \brief Sets groupmode of the current container to 'layer' and sets its label if given
+ */
+void SvgBuilder::setAsLayer(char *layer_name) {
+    _container->setAttribute("inkscape:groupmode", "layer");
+    if (layer_name) {
+        _container->setAttribute("inkscape:label", layer_name);
+    }
+}
+
+/**
+ * \brief Sets the current container's opacity
+ */
+void SvgBuilder::setGroupOpacity(double opacity) {
+    _container->setAttributeSvgDouble("opacity", CLAMP(opacity, 0.0, 1.0));
+}
+
+void SvgBuilder::saveState() {
+    SvgGraphicsState new_state;
+    new_state.group_depth = 0;
+    new_state.softmask = _state_stack.back().softmask;
+    _state_stack.push_back(new_state);
+    pushGroup();
+}
+
+void SvgBuilder::restoreState() {
+    while( _state_stack.back().group_depth > 0 ) {
+        popGroup();
+    }
+    _state_stack.pop_back();
+}
+
+Inkscape::XML::Node *SvgBuilder::pushNode(const char *name) {
+    Inkscape::XML::Node *node = _xml_doc->createElement(name);
+    _node_stack.push_back(node);
+    _container = node;
+    return node;
+}
+
+Inkscape::XML::Node *SvgBuilder::popNode() {
+    Inkscape::XML::Node *node = nullptr;
+    if ( _node_stack.size() > 1 ) {
+        node = _node_stack.back();
+        _node_stack.pop_back();
+        _container = _node_stack.back();    // Re-set container
+    } else {
+        TRACE(("popNode() called when stack is empty\n"));
+        node = _root;
+    }
+    return node;
+}
+
+Inkscape::XML::Node *SvgBuilder::pushGroup() {
+    Inkscape::XML::Node *saved_container = _container;
+    Inkscape::XML::Node *node = pushNode("svg:g");
+    saved_container->appendChild(node);
+    Inkscape::GC::release(node);
+    _state_stack.back().group_depth++;
+    // Set as a layer if this is a top-level group
+    if ( _container->parent() == _root && _is_top_level ) {
+        static int layer_count = 1;
+        if (_page_num) {
+            gchar *layer_name = g_strdup_printf("Page %d", _page_num);
+            setAsLayer(layer_name);
+            g_free(layer_name);
+        } else if ( layer_count > 1 ) {
+            gchar *layer_name = g_strdup_printf("%s%d", _docname, layer_count);
+            setAsLayer(layer_name);
+            g_free(layer_name);
+            layer_count++;
+        } else {
+            setAsLayer(_docname);
+            layer_count++;
+        }
+    }
+    if (_container->parent()->attribute("inkscape:groupmode") != nullptr) {
+        _ttm[0] = _ttm[3] = 1.0;    // clear ttm if parent is a layer
+        _ttm[1] = _ttm[2] = _ttm[4] = _ttm[5] = 0.0;
+        _ttm_is_set = false;
+    }
+    return _container;
+}
+
+Inkscape::XML::Node *SvgBuilder::popGroup() {
+    if (_container != _root) {  // Pop if the current container isn't root
+        popNode();
+        _state_stack.back().group_depth--;
+    }
+
+    return _container;
+}
+
+Inkscape::XML::Node *SvgBuilder::getContainer() {
+    return _container;
+}
+
+static gchar *svgConvertRGBToText(double r, double g, double b) {
+    using Inkscape::Filters::clamp;
+    static gchar tmp[1023] = {0};
+    snprintf(tmp, 1023,
+             "#%02x%02x%02x",
+             clamp(SP_COLOR_F_TO_U(r)),
+             clamp(SP_COLOR_F_TO_U(g)),
+             clamp(SP_COLOR_F_TO_U(b)));
+    return (gchar *)&tmp;
+}
+
+static gchar *svgConvertGfxRGB(GfxRGB *color) {
+    double r = (double)color->r / 65535.0;
+    double g = (double)color->g / 65535.0;
+    double b = (double)color->b / 65535.0;
+    return svgConvertRGBToText(r, g, b);
+}
+
+static void svgSetTransform(Inkscape::XML::Node *node, Geom::Affine matrix) {
+    node->setAttributeOrRemoveIfEmpty("transform", sp_svg_transform_write(matrix));
+}
+
+/**
+ * \brief Generates a SVG path string from poppler's data structure
+ */
+static gchar *svgInterpretPath(_POPPLER_CONST_83 GfxPath *path) {
+    Inkscape::SVG::PathString pathString;
+    for (int i = 0 ; i < path->getNumSubpaths() ; ++i ) {
+        _POPPLER_CONST_83 GfxSubpath *subpath = path->getSubpath(i);
+        if (subpath->getNumPoints() > 0) {
+            pathString.moveTo(subpath->getX(0), subpath->getY(0));
+            int j = 1;
+            while (j < subpath->getNumPoints()) {
+                if (subpath->getCurve(j)) {
+                    pathString.curveTo(subpath->getX(j), subpath->getY(j),
+                                       subpath->getX(j+1), subpath->getY(j+1),
+                                       subpath->getX(j+2), subpath->getY(j+2));
+
+                    j += 3;
+                } else {
+                    pathString.lineTo(subpath->getX(j), subpath->getY(j));
+                    ++j;
+                }
+            }
+            if (subpath->isClosed()) {
+                pathString.closePath();
+            }
+        }
+    }
+
+    return g_strdup(pathString.c_str());
+}
+
+/**
+ * \brief Sets stroke style from poppler's GfxState data structure
+ * Uses the given SPCSSAttr for storing the style properties
+ */
+void SvgBuilder::_setStrokeStyle(SPCSSAttr *css, GfxState *state) {
+    // Stroke color/pattern
+    if ( state->getStrokeColorSpace()->getMode() == csPattern ) {
+        gchar *urltext = _createPattern(state->getStrokePattern(), state, true);
+        sp_repr_css_set_property(css, "stroke", urltext);
+        if (urltext) {
+            g_free(urltext);
+        }
+    } else {
+        GfxRGB stroke_color;
+        state->getStrokeRGB(&stroke_color);
+        sp_repr_css_set_property(css, "stroke", svgConvertGfxRGB(&stroke_color));
+    }
+
+    // Opacity
+    Inkscape::CSSOStringStream os_opacity;
+    os_opacity << state->getStrokeOpacity();
+    sp_repr_css_set_property(css, "stroke-opacity", os_opacity.str().c_str());
+
+    // Line width
+    Inkscape::CSSOStringStream os_width;
+    double lw = state->getLineWidth();
+    if (lw > 0.0) {
+        os_width << lw;
+    } else {
+        // emit a stroke which is 1px in toplevel user units
+        double pxw = Inkscape::Util::Quantity::convert(1.0, "pt", "px");
+        os_width << 1.0 / state->transformWidth(pxw);
+    }
+    sp_repr_css_set_property(css, "stroke-width", os_width.str().c_str());
+
+    // Line cap
+    switch (state->getLineCap()) {
+        case 0:
+            sp_repr_css_set_property(css, "stroke-linecap", "butt");
+            break;
+        case 1:
+            sp_repr_css_set_property(css, "stroke-linecap", "round");
+            break;
+        case 2:
+            sp_repr_css_set_property(css, "stroke-linecap", "square");
+            break;
+    }
+
+    // Line join
+    switch (state->getLineJoin()) {
+        case 0:
+            sp_repr_css_set_property(css, "stroke-linejoin", "miter");
+            break;
+        case 1:
+            sp_repr_css_set_property(css, "stroke-linejoin", "round");
+            break;
+        case 2:
+            sp_repr_css_set_property(css, "stroke-linejoin", "bevel");
+            break;
+    }
+
+    // Miterlimit
+    Inkscape::CSSOStringStream os_ml;
+    os_ml << state->getMiterLimit();
+    sp_repr_css_set_property(css, "stroke-miterlimit", os_ml.str().c_str());
+
+    // Line dash
+    int dash_length;
+    double dash_start;
+#if POPPLER_CHECK_VERSION(22, 9, 0)
+    const double *dash_pattern;
+    const std::vector<double> &dash = state->getLineDash(&dash_start);
+    dash_pattern = dash.data();
+    dash_length = dash.size();
+#else
+    double *dash_pattern;
+    state->getLineDash(&dash_pattern, &dash_length, &dash_start);
+#endif
+    if ( dash_length > 0 ) {
+        Inkscape::CSSOStringStream os_array;
+        for ( int i = 0 ; i < dash_length ; i++ ) {
+            os_array << dash_pattern[i];
+            if (i < (dash_length - 1)) {
+                os_array << ",";
+            }
+        }
+        sp_repr_css_set_property(css, "stroke-dasharray", os_array.str().c_str());
+
+        Inkscape::CSSOStringStream os_offset;
+        os_offset << dash_start;
+        sp_repr_css_set_property(css, "stroke-dashoffset", os_offset.str().c_str());
+    } else {
+        sp_repr_css_set_property(css, "stroke-dasharray", "none");
+        sp_repr_css_set_property(css, "stroke-dashoffset", nullptr);
+    }
+}
+
+/**
+ * \brief Sets fill style from poppler's GfxState data structure
+ * Uses the given SPCSSAttr for storing the style properties.
+ */
+void SvgBuilder::_setFillStyle(SPCSSAttr *css, GfxState *state, bool even_odd) {
+
+    // Fill color/pattern
+    if ( state->getFillColorSpace()->getMode() == csPattern ) {
+        gchar *urltext = _createPattern(state->getFillPattern(), state);
+        sp_repr_css_set_property(css, "fill", urltext);
+        if (urltext) {
+            g_free(urltext);
+        }
+    } else {
+        GfxRGB fill_color;
+        state->getFillRGB(&fill_color);
+        sp_repr_css_set_property(css, "fill", svgConvertGfxRGB(&fill_color));
+    }
+
+    // Opacity
+    Inkscape::CSSOStringStream os_opacity;
+    os_opacity << state->getFillOpacity();
+    sp_repr_css_set_property(css, "fill-opacity", os_opacity.str().c_str());
+    
+    // Fill rule
+    sp_repr_css_set_property(css, "fill-rule", even_odd ? "evenodd" : "nonzero");
+}
+
+/**
+ * \brief Sets blend style properties from poppler's GfxState data structure
+ * \update a SPCSSAttr with all mix-blend-mode set
+ */
+void SvgBuilder::_setBlendMode(Inkscape::XML::Node *node, GfxState *state)
+{
+    SPCSSAttr *css = sp_repr_css_attr(node, "style");
+    GfxBlendMode blendmode = state->getBlendMode();
+    if (blendmode) {
+        sp_repr_css_set_property(css, "mix-blend-mode", enum_blend_mode[blendmode].key);
+    }
+    Glib::ustring value;
+    sp_repr_css_write_string(css, value);
+    node->setAttributeOrRemoveIfEmpty("style", value);
+    sp_repr_css_attr_unref(css);
+}
+/**
+ * \brief Sets style properties from poppler's GfxState data structure
+ * \return SPCSSAttr with all the relevant properties set
+ */
+SPCSSAttr *SvgBuilder::_setStyle(GfxState *state, bool fill, bool stroke, bool even_odd) {
+    SPCSSAttr *css = sp_repr_css_attr_new();
+    if (fill) {
+        _setFillStyle(css, state, even_odd);
+    } else {
+        sp_repr_css_set_property(css, "fill", "none");
+    }
+    
+    if (stroke) {
+        _setStrokeStyle(css, state);
+    } else {
+        sp_repr_css_set_property(css, "stroke", "none");
+    }
+
+    return css;
+}
+
+/**
+ * \brief Emits the current path in poppler's GfxState data structure
+ * Can be used to do filling and stroking at once.
+ *
+ * \param fill whether the path should be filled
+ * \param stroke whether the path should be stroked
+ * \param even_odd whether the even-odd rule should be used when filling the path
+ */
+void SvgBuilder::addPath(GfxState *state, bool fill, bool stroke, bool even_odd) {
+    Inkscape::XML::Node *path = _xml_doc->createElement("svg:path");
+    gchar *pathtext = svgInterpretPath(state->getPath());
+    path->setAttribute("d", pathtext);
+    g_free(pathtext);
+
+    // Set style
+    SPCSSAttr *css = _setStyle(state, fill, stroke, even_odd);
+    sp_repr_css_change(path, css, "style");
+    sp_repr_css_attr_unref(css);
+    _setBlendMode(path, state);
+    _container->appendChild(path);
+    Inkscape::GC::release(path);
+}
+
+/**
+ * \brief Emits the current path in poppler's GfxState data structure
+ * The path is set to be filled with the given shading.
+ */
+void SvgBuilder::addShadedFill(GfxShading *shading, double *matrix, GfxPath *path,
+                               bool even_odd) {
+
+    Inkscape::XML::Node *path_node = _xml_doc->createElement("svg:path");
+    gchar *pathtext = svgInterpretPath(path);
+    path_node->setAttribute("d", pathtext);
+    g_free(pathtext);
+
+    // Set style
+    SPCSSAttr *css = sp_repr_css_attr_new();
+    gchar *id = _createGradient(shading, matrix, true);
+    if (id) {
+        gchar *urltext = g_strdup_printf ("url(#%s)", id);
+        sp_repr_css_set_property(css, "fill", urltext);
+        g_free(urltext);
+        g_free(id);
+    } else {
+        sp_repr_css_attr_unref(css);
+        Inkscape::GC::release(path_node);
+        return;
+    }
+    if (even_odd) {
+        sp_repr_css_set_property(css, "fill-rule", "evenodd");
+    }
+    sp_repr_css_set_property(css, "stroke", "none");
+    sp_repr_css_change(path_node, css, "style");
+    sp_repr_css_attr_unref(css);
+
+    _container->appendChild(path_node);
+    Inkscape::GC::release(path_node);
+
+    // Remove the clipping path emitted before the 'sh' operator
+    int up_walk = 0;
+    Inkscape::XML::Node *node = _container->parent();
+    while( node && node->childCount() == 1 && up_walk < 3 ) {
+        gchar const *clip_path_url = node->attribute("clip-path");
+        if (clip_path_url) {
+            // Obtain clipping path's id from the URL
+            gchar clip_path_id[32];
+            strncpy(clip_path_id, clip_path_url + 5, strlen(clip_path_url) - 6);
+	    clip_path_id[sizeof (clip_path_id) - 1] = '\0';
+            SPObject *clip_obj = _doc->getObjectById(clip_path_id);
+            if (clip_obj) {
+                clip_obj->deleteObject();
+                node->removeAttribute("clip-path");
+                TRACE(("removed clipping path: %s\n", clip_path_id));
+            }
+            break;
+        }
+        node = node->parent();
+        up_walk++;
+    }
+}
+
+/**
+ * \brief Clips to the current path set in GfxState
+ * \param state poppler's data structure
+ * \param even_odd whether the even-odd rule should be applied
+ */
+void SvgBuilder::clip(GfxState *state, bool even_odd) {
+    pushGroup();
+    setClipPath(state, even_odd);
+}
+
+void SvgBuilder::setClipPath(GfxState *state, bool even_odd) {
+    // Create the clipPath repr
+    Inkscape::XML::Node *clip_path = _xml_doc->createElement("svg:clipPath");
+    clip_path->setAttribute("clipPathUnits", "userSpaceOnUse");
+    // Create the path
+    Inkscape::XML::Node *path = _xml_doc->createElement("svg:path");
+    gchar *pathtext = svgInterpretPath(state->getPath());
+    path->setAttribute("d", pathtext);
+    g_free(pathtext);
+    if (even_odd) {
+        path->setAttribute("clip-rule", "evenodd");
+    }
+    clip_path->appendChild(path);
+    Inkscape::GC::release(path);
+    // Append clipPath to defs and get id
+    _doc->getDefs()->getRepr()->appendChild(clip_path);
+    gchar *urltext = g_strdup_printf ("url(#%s)", clip_path->attribute("id"));
+    Inkscape::GC::release(clip_path);
+    _container->setAttribute("clip-path", urltext);
+    g_free(urltext);
+}
+
+/**
+ * \brief Fills the given array with the current container's transform, if set
+ * \param transform array of doubles to be filled
+ * \return true on success; false on invalid transformation
+ */
+bool SvgBuilder::getTransform(double *transform) {
+    Geom::Affine svd;
+    gchar const *tr = _container->attribute("transform");
+    bool valid = sp_svg_transform_read(tr, &svd);
+    if (valid) {
+        for ( int i = 0 ; i < 6 ; i++ ) {
+            transform[i] = svd[i];
+        }
+        return true;
+    } else {
+        return false;
+    }
+}
+
+/**
+ * \brief Sets the transformation matrix of the current container
+ */
+void SvgBuilder::setTransform(double c0, double c1, double c2, double c3,
+                              double c4, double c5) {
+
+    auto matrix = Geom::Affine(c0, c1, c2, c3, c4, c5);
+
+    // Add page transformation only once (see scaledCTM in pdf-parser.cpp)
+    if ( _container->parent() == _root && _is_top_level && _page_offset) {
+        matrix = matrix * Geom::Translate(_page_left, _page_top);
+        _page_offset = false;
+    }
+
+    // do not remember the group which is a layer
+    if ((_container->attribute("inkscape:groupmode") == nullptr) && !_ttm_is_set) {
+        _ttm[0] = c0;
+        _ttm[1] = c1;
+        _ttm[2] = c2;
+        _ttm[3] = c3;
+        _ttm[4] = c4;
+        _ttm[5] = c5;
+        _ttm_is_set = true;
+    }
+
+    // Avoid transforming a group with an already set clip-path
+    if ( _container->attribute("clip-path") != nullptr ) {
+        pushGroup();
+    }
+    TRACE(("setTransform: %f %f %f %f %f %f\n", c0, c1, c2, c3, c4, c5));
+    svgSetTransform(_container, matrix);
+}
+
+void SvgBuilder::setTransform(double const *transform) {
+    setTransform(transform[0], transform[1], transform[2], transform[3],
+                 transform[4], transform[5]);
+}
+
+/**
+ * \brief Checks whether the given pattern type can be represented in SVG
+ * Used by PdfParser to decide when to do fallback operations.
+ */
+bool SvgBuilder::isPatternTypeSupported(GfxPattern *pattern) {
+    if ( pattern != nullptr ) {
+        if ( pattern->getType() == 2 ) {    // shading pattern
+            GfxShading *shading = (static_cast<GfxShadingPattern *>(pattern))->getShading();
+            int shadingType = shading->getType();
+            if ( shadingType == 2 || // axial shading
+                 shadingType == 3 ) {   // radial shading
+                return true;
+            }
+            return false;
+        } else if ( pattern->getType() == 1 ) {   // tiling pattern
+            return true;
+        }
+    }
+
+    return false;
+}
+
+/**
+ * \brief Creates a pattern from poppler's data structure
+ * Handles linear and radial gradients. Creates a new PdfParser and uses it to
+ * build a tiling pattern.
+ * \return a url pointing to the created pattern
+ */
+gchar *SvgBuilder::_createPattern(GfxPattern *pattern, GfxState *state, bool is_stroke) {
+    gchar *id = nullptr;
+    if ( pattern != nullptr ) {
+        if ( pattern->getType() == 2 ) {  // Shading pattern
+            GfxShadingPattern *shading_pattern = static_cast<GfxShadingPattern *>(pattern);
+            const double *ptm;
+            double m[6] = {1, 0, 0, 1, 0, 0};
+            double det;
+
+            // construct a (pattern space) -> (current space) transform matrix
+
+            ptm = shading_pattern->getMatrix();
+            det = _ttm[0] * _ttm[3] - _ttm[1] * _ttm[2];
+            if (det) {
+                double ittm[6];	// invert ttm
+                ittm[0] =  _ttm[3] / det;
+                ittm[1] = -_ttm[1] / det;
+                ittm[2] = -_ttm[2] / det;
+                ittm[3] =  _ttm[0] / det;
+                ittm[4] = (_ttm[2] * _ttm[5] - _ttm[3] * _ttm[4]) / det;
+                ittm[5] = (_ttm[1] * _ttm[4] - _ttm[0] * _ttm[5]) / det;
+                m[0] = ptm[0] * ittm[0] + ptm[1] * ittm[2];
+                m[1] = ptm[0] * ittm[1] + ptm[1] * ittm[3];
+                m[2] = ptm[2] * ittm[0] + ptm[3] * ittm[2];
+                m[3] = ptm[2] * ittm[1] + ptm[3] * ittm[3];
+                m[4] = ptm[4] * ittm[0] + ptm[5] * ittm[2] + ittm[4];
+                m[5] = ptm[4] * ittm[1] + ptm[5] * ittm[3] + ittm[5];
+            }
+            id = _createGradient(shading_pattern->getShading(),
+                                 m,
+                                 !is_stroke);
+        } else if ( pattern->getType() == 1 ) {   // Tiling pattern
+            id = _createTilingPattern(static_cast<GfxTilingPattern*>(pattern), state, is_stroke);
+        }
+    } else {
+        return nullptr;
+    }
+    gchar *urltext = g_strdup_printf ("url(#%s)", id);
+    g_free(id);
+    return urltext;
+}
+
+/**
+ * \brief Creates a tiling pattern from poppler's data structure
+ * Creates a sub-page PdfParser and uses it to parse the pattern's content stream.
+ * \return id of the created pattern
+ */
+gchar *SvgBuilder::_createTilingPattern(GfxTilingPattern *tiling_pattern,
+                                        GfxState *state, bool is_stroke) {
+
+    Inkscape::XML::Node *pattern_node = _xml_doc->createElement("svg:pattern");
+    // Set pattern transform matrix
+    const double *p2u = tiling_pattern->getMatrix();
+    double m[6] = {1, 0, 0, 1, 0, 0};
+    double det;
+    det = _ttm[0] * _ttm[3] - _ttm[1] * _ttm[2];    // see LP Bug 1168908
+    if (det) {
+        double ittm[6];	// invert ttm
+        ittm[0] =  _ttm[3] / det;
+        ittm[1] = -_ttm[1] / det;
+        ittm[2] = -_ttm[2] / det;
+        ittm[3] =  _ttm[0] / det;
+        ittm[4] = (_ttm[2] * _ttm[5] - _ttm[3] * _ttm[4]) / det;
+        ittm[5] = (_ttm[1] * _ttm[4] - _ttm[0] * _ttm[5]) / det;
+        m[0] = p2u[0] * ittm[0] + p2u[1] * ittm[2];
+        m[1] = p2u[0] * ittm[1] + p2u[1] * ittm[3];
+        m[2] = p2u[2] * ittm[0] + p2u[3] * ittm[2];
+        m[3] = p2u[2] * ittm[1] + p2u[3] * ittm[3];
+        m[4] = p2u[4] * ittm[0] + p2u[5] * ittm[2] + ittm[4];
+        m[5] = p2u[4] * ittm[1] + p2u[5] * ittm[3] + ittm[5];
+    }
+    Geom::Affine pat_matrix(m[0], m[1], m[2], m[3], m[4], m[5]);
+    pattern_node->setAttributeOrRemoveIfEmpty("patternTransform", sp_svg_transform_write(pat_matrix));
+    pattern_node->setAttribute("patternUnits", "userSpaceOnUse");
+    // Set pattern tiling
+    // FIXME: don't ignore XStep and YStep
+    const double *bbox = tiling_pattern->getBBox();
+    pattern_node->setAttributeSvgDouble("x", 0.0);
+    pattern_node->setAttributeSvgDouble("y", 0.0);
+    pattern_node->setAttributeSvgDouble("width", bbox[2] - bbox[0]);
+    pattern_node->setAttributeSvgDouble("height", bbox[3] - bbox[1]);
+
+    // Convert BBox for PdfParser
+    PDFRectangle box;
+    box.x1 = bbox[0];
+    box.y1 = bbox[1];
+    box.x2 = bbox[2];
+    box.y2 = bbox[3];
+    // Create new SvgBuilder and sub-page PdfParser
+    SvgBuilder *pattern_builder = new SvgBuilder(this, pattern_node);
+    PdfParser *pdf_parser = new PdfParser(_xref, pattern_builder, tiling_pattern->getResDict(),
+                                          &box);
+    // Get pattern color space
+    GfxPatternColorSpace *pat_cs = (GfxPatternColorSpace *)( is_stroke ? state->getStrokeColorSpace()
+                                                            : state->getFillColorSpace() );
+    // Set fill/stroke colors if this is an uncolored tiling pattern
+    GfxColorSpace *cs = nullptr;
+    if ( tiling_pattern->getPaintType() == 2 && ( cs = pat_cs->getUnder() ) ) {
+        GfxState *pattern_state = pdf_parser->getState();
+        pattern_state->setFillColorSpace(cs->copy());
+        pattern_state->setFillColor(state->getFillColor());
+        pattern_state->setStrokeColorSpace(cs->copy());
+        pattern_state->setStrokeColor(state->getFillColor());
+    }
+
+    // Generate the SVG pattern
+    pdf_parser->parse(tiling_pattern->getContentStream());
+
+    // Cleanup
+    delete pdf_parser;
+    delete pattern_builder;
+
+    // Append the pattern to defs
+    _doc->getDefs()->getRepr()->appendChild(pattern_node);
+    gchar *id = g_strdup(pattern_node->attribute("id"));
+    Inkscape::GC::release(pattern_node);
+
+    return id;
+}
+
+/**
+ * \brief Creates a linear or radial gradient from poppler's data structure
+ * \param shading poppler's data structure for the shading
+ * \param matrix gradient transformation, can be null
+ * \param for_shading true if we're creating this for a shading operator; false otherwise
+ * \return id of the created object
+ */
+gchar *SvgBuilder::_createGradient(GfxShading *shading, double *matrix, bool for_shading) {
+    Inkscape::XML::Node *gradient;
+    _POPPLER_CONST Function *func;
+    int num_funcs;
+    bool extend0, extend1;
+
+    if ( shading->getType() == 2 ) {  // Axial shading
+        gradient = _xml_doc->createElement("svg:linearGradient");
+        GfxAxialShading *axial_shading = static_cast<GfxAxialShading*>(shading);
+        double x1, y1, x2, y2;
+        axial_shading->getCoords(&x1, &y1, &x2, &y2);
+        gradient->setAttributeSvgDouble("x1", x1);
+        gradient->setAttributeSvgDouble("y1", y1);
+        gradient->setAttributeSvgDouble("x2", x2);
+        gradient->setAttributeSvgDouble("y2", y2);
+        extend0 = axial_shading->getExtend0();
+        extend1 = axial_shading->getExtend1();
+        num_funcs = axial_shading->getNFuncs();
+        func = axial_shading->getFunc(0);
+    } else if (shading->getType() == 3) {   // Radial shading
+        gradient = _xml_doc->createElement("svg:radialGradient");
+        GfxRadialShading *radial_shading = static_cast<GfxRadialShading*>(shading);
+        double x1, y1, r1, x2, y2, r2;
+        radial_shading->getCoords(&x1, &y1, &r1, &x2, &y2, &r2);
+        // FIXME: the inner circle's radius is ignored here
+        gradient->setAttributeSvgDouble("fx", x1);
+        gradient->setAttributeSvgDouble("fy", y1);
+        gradient->setAttributeSvgDouble("cx", x2);
+        gradient->setAttributeSvgDouble("cy", y2);
+        gradient->setAttributeSvgDouble("r", r2);
+        extend0 = radial_shading->getExtend0();
+        extend1 = radial_shading->getExtend1();
+        num_funcs = radial_shading->getNFuncs();
+        func = radial_shading->getFunc(0);
+    } else {    // Unsupported shading type
+        return nullptr;
+    }
+    gradient->setAttribute("gradientUnits", "userSpaceOnUse");
+    // If needed, flip the gradient transform around the y axis
+    if (matrix) {
+        Geom::Affine pat_matrix(matrix[0], matrix[1], matrix[2], matrix[3],
+                              matrix[4], matrix[5]);
+        if ( !for_shading && _is_top_level ) {
+            Geom::Affine flip(1.0, 0.0, 0.0, -1.0, 0.0, Inkscape::Util::Quantity::convert(_height, "px", "pt"));
+            pat_matrix *= flip;
+        }
+        gradient->setAttributeOrRemoveIfEmpty("gradientTransform", sp_svg_transform_write(pat_matrix));
+    }
+
+    if ( extend0 && extend1 ) {
+        gradient->setAttribute("spreadMethod", "pad");
+    }
+
+    if ( num_funcs > 1 || !_addGradientStops(gradient, shading, func) ) {
+        Inkscape::GC::release(gradient);
+        return nullptr;
+    }
+
+    Inkscape::XML::Node *defs = _doc->getDefs()->getRepr();
+    defs->appendChild(gradient);
+    gchar *id = g_strdup(gradient->attribute("id"));
+    Inkscape::GC::release(gradient);
+
+    return id;
+}
+
+#define EPSILON 0.0001
+/**
+ * \brief Adds a stop with the given properties to the gradient's representation
+ */
+void SvgBuilder::_addStopToGradient(Inkscape::XML::Node *gradient, double offset,
+                                    GfxRGB *color, double opacity) {
+    Inkscape::XML::Node *stop = _xml_doc->createElement("svg:stop");
+    SPCSSAttr *css = sp_repr_css_attr_new();
+    Inkscape::CSSOStringStream os_opacity;
+    gchar *color_text = nullptr;
+    if ( _transp_group_stack != nullptr && _transp_group_stack->for_softmask ) {
+        double gray = (double)color->r / 65535.0;
+        gray = CLAMP(gray, 0.0, 1.0);
+        os_opacity << gray;
+        color_text = (char*) "#ffffff";
+    } else {
+        os_opacity << opacity;
+        color_text = svgConvertGfxRGB(color);
+    }
+    sp_repr_css_set_property(css, "stop-opacity", os_opacity.str().c_str());
+    sp_repr_css_set_property(css, "stop-color", color_text);
+
+    sp_repr_css_change(stop, css, "style");
+    sp_repr_css_attr_unref(css);
+    stop->setAttributeCssDouble("offset", offset);
+
+    gradient->appendChild(stop);
+    Inkscape::GC::release(stop);
+}
+
+static bool svgGetShadingColorRGB(GfxShading *shading, double offset, GfxRGB *result) {
+    GfxColorSpace *color_space = shading->getColorSpace();
+    GfxColor temp;
+    if ( shading->getType() == 2 ) {  // Axial shading
+        (static_cast<GfxAxialShading*>(shading))->getColor(offset, &temp);
+    } else if ( shading->getType() == 3 ) { // Radial shading
+        (static_cast<GfxRadialShading*>(shading))->getColor(offset, &temp);
+    } else {
+        return false;
+    }
+    // Convert it to RGB
+    color_space->getRGB(&temp, result);
+
+    return true;
+}
+
+#define INT_EPSILON 8
+bool SvgBuilder::_addGradientStops(Inkscape::XML::Node *gradient, GfxShading *shading,
+                                   _POPPLER_CONST Function *func) {
+    int type = func->getType();
+    if ( type == 0 || type == 2 ) {  // Sampled or exponential function
+        GfxRGB stop1, stop2;
+        if ( !svgGetShadingColorRGB(shading, 0.0, &stop1) ||
+             !svgGetShadingColorRGB(shading, 1.0, &stop2) ) {
+            return false;
+        } else {
+            _addStopToGradient(gradient, 0.0, &stop1, 1.0);
+            _addStopToGradient(gradient, 1.0, &stop2, 1.0);
+        }
+    } else if ( type == 3 ) { // Stitching
+        auto stitchingFunc = static_cast<_POPPLER_CONST StitchingFunction*>(func);
+        const double *bounds = stitchingFunc->getBounds();
+        const double *encode = stitchingFunc->getEncode();
+        int num_funcs = stitchingFunc->getNumFuncs();
+
+        // Add stops from all the stitched functions
+        GfxRGB prev_color, color;
+        svgGetShadingColorRGB(shading, bounds[0], &prev_color);
+        _addStopToGradient(gradient, bounds[0], &prev_color, 1.0);
+        for ( int i = 0 ; i < num_funcs ; i++ ) {
+            svgGetShadingColorRGB(shading, bounds[i + 1], &color);
+            // Add stops
+            if (stitchingFunc->getFunc(i)->getType() == 2) {    // process exponential fxn
+                double expE = (static_cast<_POPPLER_CONST ExponentialFunction*>(stitchingFunc->getFunc(i)))->getE();
+                if (expE > 1.0) {
+                    expE = (bounds[i + 1] - bounds[i])/expE;    // approximate exponential as a single straight line at x=1
+                    if (encode[2*i] == 0) {    // normal sequence
+                        _addStopToGradient(gradient, bounds[i + 1] - expE, &prev_color, 1.0);
+                    } else {                   // reflected sequence
+                        _addStopToGradient(gradient, bounds[i] + expE, &color, 1.0);
+                    }
+                }
+            }
+            _addStopToGradient(gradient, bounds[i + 1], &color, 1.0);
+            prev_color = color;
+        }
+    } else { // Unsupported function type
+        return false;
+    }
+
+    return true;
+}
+
+/**
+ * \brief Sets _invalidated_style to true to indicate that styles have to be updated
+ * Used for text output when glyphs are buffered till a font change
+ */
+void SvgBuilder::updateStyle(GfxState *state) {
+    if (_in_text_object) {
+        _invalidated_style = true;
+        _current_state = state;
+    }
+}
+
+/*
+    MatchingChars
+    Count for how many characters s1 matches sp taking into account 
+    that a space in sp may be removed or replaced by some other tokens
+    specified in the code. (Bug LP #179589)
+*/
+static size_t MatchingChars(std::string s1, std::string sp)
+{
+    size_t is = 0;
+    size_t ip = 0;
+
+    while(is < s1.length() && ip < sp.length()) {
+        if (s1[is] == sp[ip]) {
+            is++; ip++;
+        } else if (sp[ip] == ' ') {
+            ip++;
+            if (s1[is] == '_') { // Valid matches to spaces in sp.
+                is++;
+            }
+        } else {
+            break;
+        }
+    }
+    return ip;
+}
+
+/*
+    SvgBuilder::_BestMatchingFont
+    Scan the available fonts to find the font name that best matches PDFname.
+    (Bug LP #179589)
+*/
+std::string SvgBuilder::_BestMatchingFont(std::string PDFname)
+{
+    double bestMatch = 0;
+    std::string bestFontname = "Arial";
+    
+    for (auto fontname : _availableFontNames) {
+        // At least the first word of the font name should match.
+        size_t minMatch = fontname.find(" ");
+        if (minMatch == std::string::npos) {
+           minMatch = fontname.length();
+        }
+        
+        size_t Match = MatchingChars(PDFname, fontname);
+        if (Match >= minMatch) {
+            double relMatch = (float)Match / (fontname.length() + PDFname.length());
+            if (relMatch > bestMatch) {
+                bestMatch = relMatch;
+                bestFontname = fontname;
+            }
+        }
+    }
+
+    if (bestMatch == 0)
+        return PDFname;
+    else
+        return bestFontname;
+}
+
+/**
+ * This array holds info about translating font weight names to more or less CSS equivalents
+ */
+static char *font_weight_translator[][2] = {
+    // clang-format off
+    {(char*) "bold",        (char*) "bold"},
+    {(char*) "light",       (char*) "300"},
+    {(char*) "black",       (char*) "900"},
+    {(char*) "heavy",       (char*) "900"},
+    {(char*) "ultrabold",   (char*) "800"},
+    {(char*) "extrabold",   (char*) "800"},
+    {(char*) "demibold",    (char*) "600"},
+    {(char*) "semibold",    (char*) "600"},
+    {(char*) "medium",      (char*) "500"},
+    {(char*) "book",        (char*) "normal"},
+    {(char*) "regular",     (char*) "normal"},
+    {(char*) "roman",       (char*) "normal"},
+    {(char*) "normal",      (char*) "normal"},
+    {(char*) "ultralight",  (char*) "200"},
+    {(char*) "extralight",  (char*) "200"},
+    {(char*) "thin",        (char*) "100"}
+    // clang-format on
+};
+
+/**
+ * \brief Updates _font_style according to the font set in parameter state
+ */
+void SvgBuilder::updateFont(GfxState *state) {
+
+    TRACE(("updateFont()\n"));
+    _need_font_update = false;
+    updateTextMatrix(state);    // Ensure that we have a text matrix built
+
+    _font_style = sp_repr_css_attr_new();
+    auto font = state->getFont();
+    // Store original name
+    if (font->getName()) {
+        _font_specification = font->getName()->getCString();
+    } else {
+        _font_specification = "Arial";
+    }
+
+    // Prune the font name to get the correct font family name
+    // In a PDF font names can look like this: IONIPB+MetaPlusBold-Italic
+    char *font_family = nullptr;
+    char *font_style = nullptr;
+    char *font_style_lowercase = nullptr;
+    const char *plus_sign = strstr(_font_specification, "+");
+    if (plus_sign) {
+        font_family = g_strdup(plus_sign + 1);
+        _font_specification = plus_sign + 1;
+    } else {
+        font_family = g_strdup(_font_specification);
+    }
+    char *style_delim = nullptr;
+    if ( ( style_delim = g_strrstr(font_family, "-") ) ||
+         ( style_delim = g_strrstr(font_family, ",") ) ) {
+        font_style = style_delim + 1;
+        font_style_lowercase = g_ascii_strdown(font_style, -1);
+        style_delim[0] = 0;
+    }
+
+    // Font family
+    if (font->getFamily()) { // if font family is explicitly given use it.
+        sp_repr_css_set_property(_font_style, "font-family", font->getFamily()->getCString());
+    } else { 
+        int attr_value = _preferences->getAttributeInt("localFonts", 1);
+        if (attr_value != 0) {
+            // Find the font that best matches the stripped down (orig)name (Bug LP #179589).
+            sp_repr_css_set_property(_font_style, "font-family", _BestMatchingFont(font_family).c_str());
+        } else {
+            sp_repr_css_set_property(_font_style, "font-family", font_family);
+        }
+    }
+
+    // Font style
+    if (font->isItalic()) {
+        sp_repr_css_set_property(_font_style, "font-style", "italic");
+    } else if (font_style) {
+        if ( strstr(font_style_lowercase, "italic") ||
+             strstr(font_style_lowercase, "slanted") ) {
+            sp_repr_css_set_property(_font_style, "font-style", "italic");
+        } else if (strstr(font_style_lowercase, "oblique")) {
+            sp_repr_css_set_property(_font_style, "font-style", "oblique");
+        }
+    }
+
+    // Font variant -- default 'normal' value
+    sp_repr_css_set_property(_font_style, "font-variant", "normal");
+
+    // Font weight
+    GfxFont::Weight font_weight = font->getWeight();
+    char *css_font_weight = nullptr;
+    if ( font_weight != GfxFont::WeightNotDefined ) {
+        if ( font_weight == GfxFont::W400 ) {
+            css_font_weight = (char*) "normal";
+        } else if ( font_weight == GfxFont::W700 ) {
+            css_font_weight = (char*) "bold";
+        } else {
+            gchar weight_num[4] = "100";
+            weight_num[0] = (gchar)( '1' + (font_weight - GfxFont::W100) );
+            sp_repr_css_set_property(_font_style, "font-weight", (gchar *)&weight_num);
+        }
+    } else if (font_style) {
+        // Apply the font weight translations
+        int num_translations = sizeof(font_weight_translator) / ( 2 * sizeof(char *) );
+        for ( int i = 0 ; i < num_translations ; i++ ) {
+            if (strstr(font_style_lowercase, font_weight_translator[i][0])) {
+                css_font_weight = font_weight_translator[i][1];
+            }
+        }
+    } else {
+        css_font_weight = (char*) "normal";
+    }
+    if (css_font_weight) {
+        sp_repr_css_set_property(_font_style, "font-weight", css_font_weight);
+    }
+    g_free(font_family);
+    if (font_style_lowercase) {
+        g_free(font_style_lowercase);
+    }
+
+    // Font stretch
+    GfxFont::Stretch font_stretch = font->getStretch();
+    gchar *stretch_value = nullptr;
+    switch (font_stretch) {
+        case GfxFont::UltraCondensed:
+            stretch_value = (char*) "ultra-condensed";
+            break;
+        case GfxFont::ExtraCondensed:
+            stretch_value = (char*) "extra-condensed";
+            break;
+        case GfxFont::Condensed:
+            stretch_value = (char*) "condensed";
+            break;
+        case GfxFont::SemiCondensed:
+            stretch_value = (char*) "semi-condensed";
+            break;
+        case GfxFont::Normal:
+            stretch_value = (char*) "normal";
+            break;
+        case GfxFont::SemiExpanded:
+            stretch_value = (char*) "semi-expanded";
+            break;
+        case GfxFont::Expanded:
+            stretch_value = (char*) "expanded";
+            break;
+        case GfxFont::ExtraExpanded:
+            stretch_value = (char*) "extra-expanded";
+            break;
+        case GfxFont::UltraExpanded:
+            stretch_value = (char*) "ultra-expanded";
+            break;
+        default:
+            break;
+    }
+    if ( stretch_value != nullptr ) {
+        sp_repr_css_set_property(_font_style, "font-stretch", stretch_value);
+    }
+
+    // Font size
+    Inkscape::CSSOStringStream os_font_size;
+    double css_font_size = _font_scaling * state->getFontSize();
+    if ( font->getType() == fontType3 ) {
+        const double *font_matrix = font->getFontMatrix();
+        if ( font_matrix[0] != 0.0 ) {
+            css_font_size *= font_matrix[3] / font_matrix[0];
+        }
+    }
+    os_font_size << css_font_size;
+    sp_repr_css_set_property(_font_style, "font-size", os_font_size.str().c_str());
+
+    // Writing mode
+    if ( font->getWMode() == 0 ) {
+        sp_repr_css_set_property(_font_style, "writing-mode", "lr");
+    } else {
+        sp_repr_css_set_property(_font_style, "writing-mode", "tb");
+    }
+
+    _invalidated_style = true;
+}
+
+/**
+ * \brief Shifts the current text position by the given amount (specified in text space)
+ */
+void SvgBuilder::updateTextShift(GfxState *state, double shift) {
+    double shift_value = -shift * 0.001 * fabs(state->getFontSize());
+    if (state->getFont()->getWMode()) {
+        _text_position[1] += shift_value;
+    } else {
+        _text_position[0] += shift_value;
+    }
+}
+
+/**
+ * \brief Updates current text position
+ */
+void SvgBuilder::updateTextPosition(double tx, double ty) {
+    Geom::Point new_position(tx, ty);
+    _text_position = new_position;
+}
+
+/**
+ * \brief Flushes the buffered characters
+ */
+void SvgBuilder::updateTextMatrix(GfxState *state) {
+    _flushText();
+    // Update text matrix
+    const double *text_matrix = state->getTextMat();
+    double w_scale = sqrt( text_matrix[0] * text_matrix[0] + text_matrix[2] * text_matrix[2] );
+    double h_scale = sqrt( text_matrix[1] * text_matrix[1] + text_matrix[3] * text_matrix[3] );
+    double max_scale;
+    if ( w_scale > h_scale ) {
+        max_scale = w_scale;
+    } else {
+        max_scale = h_scale;
+    }
+    // Calculate new text matrix
+    Geom::Affine new_text_matrix(text_matrix[0] * state->getHorizScaling(),
+                               text_matrix[1] * state->getHorizScaling(),
+                               -text_matrix[2], -text_matrix[3],
+                               0.0, 0.0);
+
+    if ( fabs( max_scale - 1.0 ) > EPSILON ) {
+        // Cancel out scaling by font size in text matrix
+        for ( int i = 0 ; i < 4 ; i++ ) {
+            new_text_matrix[i] /= max_scale;
+        }
+    }
+    _text_matrix = new_text_matrix;
+    _font_scaling = max_scale;
+}
+
+/**
+ * \brief Writes the buffered characters to the SVG document
+ */
+void SvgBuilder::_flushText() {
+    // Ignore empty strings
+    if ( _glyphs.empty()) {
+        _glyphs.clear();
+        return;
+    }
+    std::vector<SvgGlyph>::iterator i = _glyphs.begin();
+    const SvgGlyph& first_glyph = (*i);
+    int render_mode = first_glyph.render_mode;
+    // Ignore invisible characters
+    if ( render_mode == 3 ) {
+        _glyphs.clear();
+        return;
+    }
+
+    Inkscape::XML::Node *text_node = _xml_doc->createElement("svg:text");
+
+    // we preserve spaces in the text objects we create, this applies to any descendant
+    text_node->setAttribute("xml:space", "preserve");
+
+    // Set text matrix
+    Geom::Affine text_transform(_text_matrix);
+    text_transform[4] = first_glyph.position[0];
+    text_transform[5] = first_glyph.position[1];
+    text_node->setAttributeOrRemoveIfEmpty("transform", sp_svg_transform_write(text_transform));
+
+    bool new_tspan = true;
+    bool same_coords[2] = {true, true};
+    Geom::Point last_delta_pos;
+    unsigned int glyphs_in_a_row = 0;
+    Inkscape::XML::Node *tspan_node = nullptr;
+    Glib::ustring x_coords;
+    Glib::ustring y_coords;
+    Glib::ustring text_buffer;
+
+    // Output all buffered glyphs
+    while (true) {
+        const SvgGlyph& glyph = (*i);
+        auto prev_iterator = (i == _glyphs.begin()) ? _glyphs.end() : (i-1);
+        // Check if we need to make a new tspan
+        if (glyph.style_changed) {
+            new_tspan = true;
+        } else if ( i != _glyphs.begin() ) {
+            const SvgGlyph& prev_glyph = (*prev_iterator);
+            if ( !( ( glyph.dy == 0.0 && prev_glyph.dy == 0.0 &&
+                     glyph.text_position[1] == prev_glyph.text_position[1] ) ||
+                    ( glyph.dx == 0.0 && prev_glyph.dx == 0.0 &&
+                     glyph.text_position[0] == prev_glyph.text_position[0] ) ) ) {
+                new_tspan = true;
+            }
+        }
+
+        // Create tspan node if needed
+        if ( new_tspan || i == _glyphs.end() ) {
+            if (tspan_node) {
+                // Set the x and y coordinate arrays
+                if ( same_coords[0] ) {
+                    tspan_node->setAttributeSvgDouble("x", last_delta_pos[0]);
+                } else {
+                    tspan_node->setAttributeOrRemoveIfEmpty("x", x_coords);
+                }
+                if ( same_coords[1] ) {
+                    tspan_node->setAttributeSvgDouble("y", last_delta_pos[1]);
+                } else {
+                    tspan_node->setAttributeOrRemoveIfEmpty("y", y_coords);
+                }
+                TRACE(("tspan content: %s\n", text_buffer.c_str()));
+                if ( glyphs_in_a_row > 1 ) {
+                    tspan_node->setAttribute("sodipodi:role", "line");
+                }
+                // Add text content node to tspan
+                Inkscape::XML::Node *text_content = _xml_doc->createTextNode(text_buffer.c_str());
+                tspan_node->appendChild(text_content);
+                Inkscape::GC::release(text_content);
+                text_node->appendChild(tspan_node);
+                // Clear temporary buffers
+                x_coords.clear();
+                y_coords.clear();
+                text_buffer.clear();
+                Inkscape::GC::release(tspan_node);
+                glyphs_in_a_row = 0;
+            }
+            if ( i == _glyphs.end() ) {
+                sp_repr_css_attr_unref((*prev_iterator).style);
+                break;
+            } else {
+                tspan_node = _xml_doc->createElement("svg:tspan");
+                
+                ///////
+                // Create a font specification string and save the attribute in the style
+                PangoFontDescription *descr = pango_font_description_from_string(glyph.font_specification);
+                Glib::ustring properFontSpec = font_factory::Default()->ConstructFontSpecification(descr);
+                pango_font_description_free(descr);
+                sp_repr_css_set_property(glyph.style, "-inkscape-font-specification", properFontSpec.c_str());
+
+                // Set style and unref SPCSSAttr if it won't be needed anymore
+                // assume all <tspan> nodes in a <text> node share the same style
+                sp_repr_css_change(text_node, glyph.style, "style");
+                if ( glyph.style_changed && i != _glyphs.begin() ) {    // Free previous style
+                    sp_repr_css_attr_unref((*prev_iterator).style);
+                }
+            }
+            new_tspan = false;
+        }
+        if ( glyphs_in_a_row > 0 && i != _glyphs.begin() ) {
+            x_coords.append(" ");
+            y_coords.append(" ");
+            // Check if we have the same coordinates
+            const SvgGlyph& prev_glyph = (*prev_iterator);
+            for ( int p = 0 ; p < 2 ; p++ ) {
+                if ( glyph.text_position[p] != prev_glyph.text_position[p] ) {
+                    same_coords[p] = false;
+                }
+            }
+        }
+        // Append the coordinates to their respective strings
+        Geom::Point delta_pos( glyph.text_position - first_glyph.text_position );
+        delta_pos[1] += glyph.rise;
+        delta_pos[1] *= -1.0;   // flip it
+        delta_pos *= _font_scaling;
+        Inkscape::CSSOStringStream os_x;
+        os_x << delta_pos[0];
+        x_coords.append(os_x.str());
+        Inkscape::CSSOStringStream os_y;
+        os_y << delta_pos[1];
+        y_coords.append(os_y.str());
+        last_delta_pos = delta_pos;
+
+        // Append the character to the text buffer
+	if ( !glyph.code.empty() ) {
+            text_buffer.append(1, glyph.code[0]);
+	}
+
+        glyphs_in_a_row++;
+        ++i;
+    }
+    _container->appendChild(text_node);
+    Inkscape::GC::release(text_node);
+
+    _glyphs.clear();
+}
+
+void SvgBuilder::beginString(GfxState *state) {
+    if (_need_font_update) {
+        updateFont(state);
+    }
+    IFTRACE(double *m = state->getTextMat());
+    TRACE(("tm: %f %f %f %f %f %f\n",m[0], m[1],m[2], m[3], m[4], m[5]));
+    IFTRACE(m = state->getCTM());
+    TRACE(("ctm: %f %f %f %f %f %f\n",m[0], m[1],m[2], m[3], m[4], m[5]));
+}
+
+/**
+ * \brief Adds the specified character to the text buffer
+ * Takes care of converting it to UTF-8 and generates a new style repr if style
+ * has changed since the last call.
+ */
+void SvgBuilder::addChar(GfxState *state, double x, double y,
+                         double dx, double dy,
+                         double originX, double originY,
+                         CharCode /*code*/, int /*nBytes*/, Unicode const *u, int uLen) {
+
+    // Skip control characters, found in LaTeX generated PDFs
+    // https://gitlab.com/inkscape/inkscape/-/issues/1369
+    if (uLen > 0 && u[0] < 0x80 && g_ascii_iscntrl(u[0]) && !g_ascii_isspace(u[0])) {
+        g_warning("Skipping ASCII control character %u", u[0]);
+        _text_position += Geom::Point(dx, dy);
+        return;
+    }
+
+    bool is_space = ( uLen == 1 && u[0] == 32 );
+    // Skip beginning space
+    if ( is_space && _glyphs.empty()) {
+        Geom::Point delta(dx, dy);
+         _text_position += delta;
+         return;
+    }
+    // Allow only one space in a row
+    if ( is_space && (_glyphs[_glyphs.size() - 1].code.size() == 1) &&
+         (_glyphs[_glyphs.size() - 1].code[0] == 32) ) {
+        Geom::Point delta(dx, dy);
+        _text_position += delta;
+        return;
+    }
+
+    SvgGlyph new_glyph;
+    new_glyph.is_space = is_space;
+    new_glyph.position = Geom::Point( x - originX, y - originY );
+    new_glyph.text_position = _text_position;
+    new_glyph.dx = dx;
+    new_glyph.dy = dy;
+    Geom::Point delta(dx, dy);
+    _text_position += delta;
+
+    // Convert the character to UTF-8 since that's our SVG document's encoding
+    {
+        gunichar2 uu[8] = {0};
+
+        for (int i = 0; i < uLen; i++) {
+            uu[i] = u[i];
+        }
+
+        gchar *tmp = g_utf16_to_utf8(uu, uLen, nullptr, nullptr, nullptr);
+        if ( tmp && *tmp ) {
+            new_glyph.code = tmp;
+        } else {
+            new_glyph.code.clear();
+        }
+        g_free(tmp);
+    }
+
+    // Copy current style if it has changed since the previous glyph
+    if (_invalidated_style || _glyphs.empty()) {
+        new_glyph.style_changed = true;
+        int render_mode = state->getRender();
+        // Set style
+        bool has_fill = !( render_mode & 1 );
+        bool has_stroke = ( render_mode & 3 ) == 1 || ( render_mode & 3 ) == 2;
+        new_glyph.style = _setStyle(state, has_fill, has_stroke);
+        // Find a way to handle blend modes on text
+        /* GfxBlendMode blendmode = state->getBlendMode();
+        if (blendmode) {
+            sp_repr_css_set_property(new_glyph.style, "mix-blend-mode", enum_blend_mode[blendmode].key);
+        } */
+        new_glyph.render_mode = render_mode;
+        sp_repr_css_merge(new_glyph.style, _font_style); // Merge with font style
+        _invalidated_style = false;
+    } else {
+        new_glyph.style_changed = false;
+        // Point to previous glyph's style information
+        const SvgGlyph& prev_glyph = _glyphs.back();
+        new_glyph.style = prev_glyph.style;
+        /* GfxBlendMode blendmode = state->getBlendMode();
+        if (blendmode) {
+            sp_repr_css_set_property(new_glyph.style, "mix-blend-mode", enum_blend_mode[blendmode].key);
+        } */
+        new_glyph.render_mode = prev_glyph.render_mode;
+    }
+    new_glyph.font_specification = _font_specification;
+    new_glyph.rise = state->getRise();
+
+    _glyphs.push_back(new_glyph);
+}
+
+void SvgBuilder::endString(GfxState * /*state*/) {
+}
+
+void SvgBuilder::beginTextObject(GfxState *state) {
+    _in_text_object = true;
+    _invalidated_style = true;  // Force copying of current state
+    _current_state = state;
+}
+
+void SvgBuilder::endTextObject(GfxState * /*state*/) {
+    _flushText();
+    // TODO: clip if render_mode >= 4
+    _in_text_object = false;
+}
+
+/**
+ * Helper functions for supporting direct PNG output into a base64 encoded stream
+ */
+void png_write_vector(png_structp png_ptr, png_bytep data, png_size_t length)
+{
+    auto *v_ptr = reinterpret_cast<std::vector<guchar> *>(png_get_io_ptr(png_ptr)); // Get pointer to stream
+    for ( unsigned i = 0 ; i < length ; i++ ) {
+        v_ptr->push_back(data[i]);
+    }
+}
+
+/**
+ * \brief Creates an <image> element containing the given ImageStream as a PNG
+ *
+ */
+Inkscape::XML::Node *SvgBuilder::_createImage(Stream *str, int width, int height,
+                                              GfxImageColorMap *color_map, bool interpolate,
+                                              int *mask_colors, bool alpha_only,
+                                              bool invert_alpha) {
+
+    // Create PNG write struct
+    png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, nullptr, nullptr, nullptr);
+    if ( png_ptr == nullptr ) {
+        return nullptr;
+    }
+    // Create PNG info struct
+    png_infop info_ptr = png_create_info_struct(png_ptr);
+    if ( info_ptr == nullptr ) {
+        png_destroy_write_struct(&png_ptr, nullptr);
+        return nullptr;
+    }
+    // Set error handler
+    if (setjmp(png_jmpbuf(png_ptr))) {
+        png_destroy_write_struct(&png_ptr, &info_ptr);
+        return nullptr;
+    }
+    // Decide whether we should embed this image
+    int attr_value = _preferences->getAttributeInt("embedImages", 1);
+    bool embed_image = ( attr_value != 0 );
+    // Set read/write functions
+    std::vector<guchar> png_buffer;
+    FILE *fp = nullptr;
+    gchar *file_name = nullptr;
+    if (embed_image) {
+        png_set_write_fn(png_ptr, &png_buffer, png_write_vector, nullptr);
+    } else {
+        static int counter = 0;
+        file_name = g_strdup_printf("%s_img%d.png", _docname, counter++);
+        fp = fopen(file_name, "wb");
+        if ( fp == nullptr ) {
+            png_destroy_write_struct(&png_ptr, &info_ptr);
+            g_free(file_name);
+            return nullptr;
+        }
+        png_init_io(png_ptr, fp);
+    }
+
+    // Set header data
+    if ( !invert_alpha && !alpha_only ) {
+        png_set_invert_alpha(png_ptr);
+    }
+    png_color_8 sig_bit;
+    if (alpha_only) {
+        png_set_IHDR(png_ptr, info_ptr,
+                     width,
+                     height,
+                     8, /* bit_depth */
+                     PNG_COLOR_TYPE_GRAY,
+                     PNG_INTERLACE_NONE,
+                     PNG_COMPRESSION_TYPE_BASE,
+                     PNG_FILTER_TYPE_BASE);
+        sig_bit.red = 0;
+        sig_bit.green = 0;
+        sig_bit.blue = 0;
+        sig_bit.gray = 8;
+        sig_bit.alpha = 0;
+    } else {
+        png_set_IHDR(png_ptr, info_ptr,
+                     width,
+                     height,
+                     8, /* bit_depth */
+                     PNG_COLOR_TYPE_RGB_ALPHA,
+                     PNG_INTERLACE_NONE,
+                     PNG_COMPRESSION_TYPE_BASE,
+                     PNG_FILTER_TYPE_BASE);
+        sig_bit.red = 8;
+        sig_bit.green = 8;
+        sig_bit.blue = 8;
+        sig_bit.alpha = 8;
+    }
+    png_set_sBIT(png_ptr, info_ptr, &sig_bit);
+    png_set_bgr(png_ptr);
+    // Write the file header
+    png_write_info(png_ptr, info_ptr);
+
+    // Convert pixels
+    ImageStream *image_stream;
+    if (alpha_only) {
+        if (color_map) {
+            image_stream = new ImageStream(str, width, color_map->getNumPixelComps(),
+                                           color_map->getBits());
+        } else {
+            image_stream = new ImageStream(str, width, 1, 1);
+        }
+        image_stream->reset();
+
+        // Convert grayscale values
+        unsigned char *buffer = new unsigned char[width];
+        int invert_bit = invert_alpha ? 1 : 0;
+        for ( int y = 0 ; y < height ; y++ ) {
+            unsigned char *row = image_stream->getLine();
+            if (color_map) {
+                color_map->getGrayLine(row, buffer, width);
+            } else {
+                unsigned char *buf_ptr = buffer;
+                for ( int x = 0 ; x < width ; x++ ) {
+                    if ( row[x] ^ invert_bit ) {
+                        *buf_ptr++ = 0;
+                    } else {
+                        *buf_ptr++ = 255;
+                    }
+                }
+            }
+            png_write_row(png_ptr, (png_bytep)buffer);
+        }
+        delete [] buffer;
+    } else if (color_map) {
+        image_stream = new ImageStream(str, width,
+                                       color_map->getNumPixelComps(),
+                                       color_map->getBits());
+        image_stream->reset();
+
+        // Convert RGB values
+        unsigned int *buffer = new unsigned int[width];
+        if (mask_colors) {
+            for ( int y = 0 ; y < height ; y++ ) {
+                unsigned char *row = image_stream->getLine();
+                color_map->getRGBLine(row, buffer, width);
+
+                unsigned int *dest = buffer;
+                for ( int x = 0 ; x < width ; x++ ) {
+                    // Check each color component against the mask
+                    for ( int i = 0; i < color_map->getNumPixelComps() ; i++) {
+                        if ( row[i] < mask_colors[2*i] * 255 ||
+                             row[i] > mask_colors[2*i + 1] * 255 ) {
+                            *dest = *dest | 0xff000000;
+                            break;
+                        }
+                    }
+                    // Advance to the next pixel
+                    row += color_map->getNumPixelComps();
+                    dest++;
+                }
+                // Write it to the PNG
+                png_write_row(png_ptr, (png_bytep)buffer);
+            }
+        } else {
+            for ( int i = 0 ; i < height ; i++ ) {
+                unsigned char *row = image_stream->getLine();
+                memset((void*)buffer, 0xff, sizeof(int) * width);
+                color_map->getRGBLine(row, buffer, width);
+                png_write_row(png_ptr, (png_bytep)buffer);
+            }
+        }
+        delete [] buffer;
+
+    } else {    // A colormap must be provided, so quit
+        png_destroy_write_struct(&png_ptr, &info_ptr);
+        if (!embed_image) {
+            fclose(fp);
+            g_free(file_name);
+        }
+        return nullptr;
+    }
+    delete image_stream;
+    str->close();
+    // Close PNG
+    png_write_end(png_ptr, info_ptr);
+    png_destroy_write_struct(&png_ptr, &info_ptr);
+
+    // Create repr
+    Inkscape::XML::Node *image_node = _xml_doc->createElement("svg:image");
+    image_node->setAttributeSvgDouble("width", 1);
+    image_node->setAttributeSvgDouble("height", 1);
+    if( !interpolate ) {
+        SPCSSAttr *css = sp_repr_css_attr_new();
+        // This should be changed after CSS4 Images widely supported.
+        sp_repr_css_set_property(css, "image-rendering", "optimizeSpeed");
+        sp_repr_css_change(image_node, css, "style");
+        sp_repr_css_attr_unref(css);
+    }
+
+    // PS/PDF images are placed via a transformation matrix, no preserveAspectRatio used
+    image_node->setAttribute("preserveAspectRatio", "none");
+
+    // Set transformation
+    svgSetTransform(image_node, Geom::Affine(1.0, 0.0, 0.0, -1.0, 0.0, 1.0));
+
+    // Create href
+    if (embed_image) {
+        // Append format specification to the URI
+        auto *base64String = g_base64_encode(png_buffer.data(), png_buffer.size());
+        auto png_data = std::string("data:image/png;base64,") + base64String;
+        g_free(base64String);
+        image_node->setAttributeOrRemoveIfEmpty("xlink:href", png_data);
+    } else {
+        fclose(fp);
+        image_node->setAttribute("xlink:href", file_name);
+        g_free(file_name);
+    }
+
+    return image_node;
+}
+
+/**
+ * \brief Creates a <mask> with the specified width and height and adds to <defs>
+ *  If we're not the top-level SvgBuilder, creates a <defs> too and adds the mask to it.
+ * \return the created XML node
+ */
+Inkscape::XML::Node *SvgBuilder::_createMask(double width, double height) {
+    Inkscape::XML::Node *mask_node = _xml_doc->createElement("svg:mask");
+    mask_node->setAttribute("maskUnits", "userSpaceOnUse");
+    mask_node->setAttributeSvgDouble("x", 0.0);
+    mask_node->setAttributeSvgDouble("y", 0.0);
+    mask_node->setAttributeSvgDouble("width", width);
+    mask_node->setAttributeSvgDouble("height", height);
+    // Append mask to defs
+    if (_is_top_level) {
+        _doc->getDefs()->getRepr()->appendChild(mask_node);
+        Inkscape::GC::release(mask_node);
+        return _doc->getDefs()->getRepr()->lastChild();
+    } else {    // Work around for renderer bug when mask isn't defined in pattern
+        static int mask_count = 0;
+        Inkscape::XML::Node *defs = _root->firstChild();
+        if ( !( defs && !strcmp(defs->name(), "svg:defs") ) ) {
+            // Create <defs> node
+            defs = _xml_doc->createElement("svg:defs");
+            _root->addChild(defs, nullptr);
+            Inkscape::GC::release(defs);
+            defs = _root->firstChild();
+        }
+        gchar *mask_id = g_strdup_printf("_mask%d", mask_count++);
+        mask_node->setAttribute("id", mask_id);
+        g_free(mask_id);
+        defs->appendChild(mask_node);
+        Inkscape::GC::release(mask_node);
+        return defs->lastChild();
+    }
+}
+
+void SvgBuilder::addImage(GfxState *state, Stream *str, int width, int height, GfxImageColorMap *color_map,
+                          bool interpolate, int *mask_colors)
+{
+
+    Inkscape::XML::Node *image_node = _createImage(str, width, height, color_map, interpolate, mask_colors);
+    if (image_node) {
+        _setBlendMode(image_node, state);
+        _container->appendChild(image_node);
+        Inkscape::GC::release(image_node);
+    }
+}
+
+void SvgBuilder::addImageMask(GfxState *state, Stream *str, int width, int height,
+                              bool invert, bool interpolate) {
+
+    // Create a rectangle
+    Inkscape::XML::Node *rect = _xml_doc->createElement("svg:rect");
+    rect->setAttributeSvgDouble("x", 0.0);
+    rect->setAttributeSvgDouble("y", 0.0);
+    rect->setAttributeSvgDouble("width", 1.0);
+    rect->setAttributeSvgDouble("height", 1.0);
+    svgSetTransform(rect, Geom::Affine(1.0, 0.0, 0.0, -1.0, 0.0, 1.0));
+    // Get current fill style and set it on the rectangle
+    SPCSSAttr *css = sp_repr_css_attr_new();
+    _setFillStyle(css, state, false);
+    sp_repr_css_change(rect, css, "style");
+    sp_repr_css_attr_unref(css);
+    _setBlendMode(rect, state);
+
+    // Scaling 1x1 surfaces might not work so skip setting a mask with this size
+    if ( width > 1 || height > 1 ) {
+        Inkscape::XML::Node *mask_image_node =
+            _createImage(str, width, height, nullptr, interpolate, nullptr, true, invert);
+        if (mask_image_node) {
+            // Create the mask
+            Inkscape::XML::Node *mask_node = _createMask(1.0, 1.0);
+            // Remove unnecessary transformation from the mask image
+            mask_image_node->removeAttribute("transform");
+            mask_node->appendChild(mask_image_node);
+            Inkscape::GC::release(mask_image_node);
+            gchar *mask_url = g_strdup_printf("url(#%s)", mask_node->attribute("id"));
+            rect->setAttribute("mask", mask_url);
+            g_free(mask_url);
+        }
+    }
+
+    // Add the rectangle to the container
+    _container->appendChild(rect);
+    Inkscape::GC::release(rect);
+}
+
+void SvgBuilder::addMaskedImage(GfxState *state, Stream *str, int width, int height, GfxImageColorMap *color_map,
+                                bool interpolate, Stream *mask_str, int mask_width, int mask_height, bool invert_mask,
+                                bool mask_interpolate)
+{
+
+    Inkscape::XML::Node *mask_image_node = _createImage(mask_str, mask_width, mask_height,
+                                          nullptr, mask_interpolate, nullptr, true, invert_mask);
+    Inkscape::XML::Node *image_node = _createImage(str, width, height, color_map, interpolate, nullptr);
+    if ( mask_image_node && image_node ) {
+        // Create mask for the image
+        Inkscape::XML::Node *mask_node = _createMask(1.0, 1.0);
+        // Remove unnecessary transformation from the mask image
+        mask_image_node->removeAttribute("transform");
+        mask_node->appendChild(mask_image_node);
+        // Scale the mask to the size of the image
+        Geom::Affine mask_transform((double)width, 0.0, 0.0, (double)height, 0.0, 0.0);
+        mask_node->setAttributeOrRemoveIfEmpty("maskTransform", sp_svg_transform_write(mask_transform));
+        // Set mask and add image
+        gchar *mask_url = g_strdup_printf("url(#%s)", mask_node->attribute("id"));
+        image_node->setAttribute("mask", mask_url);
+        g_free(mask_url);
+        _container->appendChild(image_node);
+    }
+    if (mask_image_node) {
+        Inkscape::GC::release(mask_image_node);
+    }
+    if (image_node) {
+        _setBlendMode(image_node, state);
+        Inkscape::GC::release(image_node);
+    }
+}
+
+void SvgBuilder::addSoftMaskedImage(GfxState *state, Stream *str, int width, int height, GfxImageColorMap *color_map,
+                                    bool interpolate, Stream *mask_str, int mask_width, int mask_height,
+                                    GfxImageColorMap *mask_color_map, bool mask_interpolate)
+{
+
+    Inkscape::XML::Node *mask_image_node = _createImage(mask_str, mask_width, mask_height,
+                                                        mask_color_map, mask_interpolate, nullptr, true);
+    Inkscape::XML::Node *image_node = _createImage(str, width, height, color_map, interpolate, nullptr);
+    if ( mask_image_node && image_node ) {
+        // Create mask for the image
+        Inkscape::XML::Node *mask_node = _createMask(1.0, 1.0);
+        // Remove unnecessary transformation from the mask image
+        mask_image_node->removeAttribute("transform");
+        mask_node->appendChild(mask_image_node);
+        // Set mask and add image
+        gchar *mask_url = g_strdup_printf("url(#%s)", mask_node->attribute("id"));
+        image_node->setAttribute("mask", mask_url);
+        g_free(mask_url);
+        _container->appendChild(image_node);
+    }
+    if (mask_image_node) {
+        Inkscape::GC::release(mask_image_node);
+    }
+    if (image_node) {
+        _setBlendMode(image_node, state);
+        Inkscape::GC::release(image_node);
+    }
+}
+
+/**
+ * \brief Starts building a new transparency group
+ */
+void SvgBuilder::pushTransparencyGroup(GfxState * /*state*/, double *bbox,
+                                       GfxColorSpace * /*blending_color_space*/,
+                                       bool isolated, bool knockout,
+                                       bool for_softmask) {
+
+    // Push node stack
+    pushNode("svg:g");
+
+    // Setup new transparency group
+    SvgTransparencyGroup *transpGroup = new SvgTransparencyGroup;
+    for (size_t i = 0; i < 4; i++) {
+        transpGroup->bbox[i] = bbox[i];        
+    }
+    transpGroup->isolated = isolated;
+    transpGroup->knockout = knockout;
+    transpGroup->for_softmask = for_softmask;
+    transpGroup->container = _container;
+
+    // Push onto the stack
+    transpGroup->next = _transp_group_stack;
+    _transp_group_stack = transpGroup;
+}
+
+void SvgBuilder::popTransparencyGroup(GfxState * /*state*/) {
+    // Restore node stack
+    popNode();
+}
+
+/**
+ * \brief Places the current transparency group into the current container
+ */
+void SvgBuilder::paintTransparencyGroup(GfxState * /*state*/, double * /*bbox*/) {
+    SvgTransparencyGroup *transpGroup = _transp_group_stack;
+    _container->appendChild(transpGroup->container);
+    Inkscape::GC::release(transpGroup->container);
+    // Pop the stack
+    _transp_group_stack = transpGroup->next;
+    delete transpGroup;
+}
+
+/**
+ * \brief Creates a mask using the current transparency group as its content
+ */
+void SvgBuilder::setSoftMask(GfxState * /*state*/, double * /*bbox*/, bool /*alpha*/,
+                             Function * /*transfer_func*/, GfxColor * /*backdrop_color*/) {
+
+    // Create mask
+    Inkscape::XML::Node *mask_node = _createMask(1.0, 1.0);
+    // Add the softmask content to it
+    SvgTransparencyGroup *transpGroup = _transp_group_stack;
+    mask_node->appendChild(transpGroup->container);
+    Inkscape::GC::release(transpGroup->container);
+    // Apply the mask
+    _state_stack.back().softmask = mask_node;
+    pushGroup();
+    gchar *mask_url = g_strdup_printf("url(#%s)", mask_node->attribute("id"));
+    _container->setAttribute("mask", mask_url);
+    g_free(mask_url);
+    // Pop the stack
+    _transp_group_stack = transpGroup->next;
+    delete transpGroup;
+}
+
+void SvgBuilder::clearSoftMask(GfxState * /*state*/) {
+    if (_state_stack.back().softmask) {
+        _state_stack.back().softmask = nullptr;
+        popGroup();
+    }
+}
+
+} } } /* namespace Inkscape, Extension, Internal */
+
+#endif /* HAVE_POPPLER */
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :